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Full Discussion: Find Duplicate files, not by name
Top Forums Shell Programming and Scripting Find Duplicate files, not by name Post 302299623 by jim mcnamara on Friday 20th of March 2009 02:27:48 PM
Old 03-20-2009
use md5 or another checksum or hash, I just used cksum:
Code:
cksum  *.jpg | sort -n > filelist

change the sort command if you use md5.

The files with identical checksums are identical. Read the file over before you go on to part 2 below:
Code:
old=""
while read sum lines filename
do
      if [[ "$sum" != "$old" ]] ; then
            old="$sum"
            continue
      fi
      rm -f "$filename"
          
done < filelist

 

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LEARN ABOUT REDHAT

cksum

cksum(n)							       cksum								  cksum(n)

NAME

       cksum - calculate a cksum(1) compatible checksum

SYNOPSIS

       package require Tcl 8.2

       package require cksum ?1.0?

       ::crc::cksum ?-format format? message

       ::crc::cksum ?-format format? -filename file

DESCRIPTION

       This  package  provides a Tcl-only implementation of the cksum(1) algorithm based upon information provided at in the GNU implementation of
       this program as part of the GNU Textutils 2.0 package.

COMMANDS

       ::crc::cksum ?-format format? message

       ::crc::cksum ?-format format? -filename file
	      The command takes string data or a file name and returns a checksum value calculated using the cksum(1)  algorithm.  The	result	is
	      formatted using the format(n) specifier provided or as an unsigned integer (%u) by default.

OPTIONS

       -filename name
	      Return a checksum for the file contents instead of for parameter data.

       -format string
	      Return the checksum using an alternative format template.

EXAMPLES

       % crc::cksum "Hello, World!"
       2609532967

       % crc::cksum -format 0x%X "Hello, World!"
       0x9B8A5027

       % crc::cksum -file cksum.tcl
       1828321145

SEE ALSO

       sum(n), crc32(n)

AUTHORS

       Pat Thoyts

KEYWORDS

       cksum, checksum, crc, crc32, cyclic redundancy check, data integrity, security

crc									1.0								  cksum(n)
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